FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN
FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN – Industrial 17.5A 600VAC Class RK5 Dual-Element Fuse
The FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN (Model FRS-R-17-1/2 or FRS-R-17.5) is a premium, industrial-grade Class RK5 dual-element time-delay power fuse manufactured by Eaton’s Bussmann series. Engineered specifically to protect AC motor circuits, inductive equipment, and power distribution systems against temporary overloads and short circuits, this 17.5-amp, 600 VAC Fusetron™ current-limiting fuse provides reliable electrical protection across commercial and industrial infrastructure.
Featuring an advanced dual-element design, the FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN provides a minimum 10-second time-delay at 500% of its rated current. This delayed response allows harmless motor startup surges and temporary inductive inrush currents to pass without nuisance opening, while instantly clearing dangerous short circuits up to 200 kA RMS Symmetrical at 600 VAC (and 20 kA at 300VDC). Its rejection-style body features a Class RK5 rejection groove on the bottom ferrule contact, preventing the accidental insertion of lower-rated Class H non-current-limiting fuses into Class R safety blocks.
As shown in the image, the fuse features a vibrant green tube body labeled with “Bussmann FUSETRON ENERGY EFFICIENT DUAL-ELEMENT TIME-DELAY CLASS RK5 FUSE FRS-R 600Vac AC IR 200kA 300Vdc DC IR 20kA”, fitted on both ends with solid copper ferrule end caps featuring the Class RK5 rejection ring profile.
Key Features of the FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN
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Dual-Element Time-Delay Design: Holds a minimum 10-second time-delay at 500% rated load, absorbing harmless motor starting currents and transformer magnetizing surges.
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Class RK5 Rejection Feature: Built with a specialized grooved rejection ferrule end cap to physically prevent non-current-limiting Class H fuses from being substituted.
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High 200 kA Interrupting Rating: Fully rated for 200 kA RMS Symmetrical at 600 VAC and 20kA at 300 VDC, delivering robust short-circuit protection for high-fault power panels.
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Energy-Efficient Fusetron Technology: Engineered to operate cooler with lower internal resistance, reducing power dissipation and lowering energy costs inside electrical cabinets.
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Current-Limiting Performance: Restricts thermal and magnetic peak let-through current under fault conditions, shielding downstream contactors, overload relays, and busbars.
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Dual AC/DC Voltage Capability: Versatile dual rating for 600VAC and up to 300VDC circuits.
Common Applications and Practical Usage
The time-delay motor protection performance of the FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN makes it a versatile choice across industrial plants and commercial buildings:
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AC Motor Branch Circuits: Ideal for direct-on-line (DOL) motor starters, pumps, fans, and compressors requiring close-sensed overcurrent protection without trip interruptions during startup.
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Transformers & Inductive Equipment: Protects control transformers and industrial power supplies against magnetizing inrush surges.
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Main Disconnects & Branch Feeders: Serves as main overcurrent protection in safety disconnect switches and distribution panelboards.
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HVAC & Refrigeration Systems: Widely used in commercial rooftop HVAC units, chillers, and industrial refrigeration control panels.
Technical Specifications
The core electrical, physical, and compliance parameters for the FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN are detailed below:
| Parameter Specification | Technical Details & Operational Values |
| Component Classification | Dual-Element Time-Delay Class RK5 Fuse |
| Primary Target Keyword | FRS-R-17-1/2 TIME DELAY FUSE BUSSMANN |
| Brand / Series | Eaton Bussmann Series / Fusetron™ FRS-R |
| Amperage Rating | 17.5 Amps (17- 1/2 A) |
| Voltage Rating | 600 VAC / 300 VDC |
| Interrupt Rating (IR) | 200 kA RMS Symmetrical at 600 VAC / 20 kA at 300 VDC |
| Response Characteristic | Time-Delay (Min.10 seconds at 500% current) |
| Fuse Class & Form Factor | UL Class RK5 Ferrule Style (0.81” x 5.0” L / 20.6mm x 127.0mm) |
| Body Material & Caps | High-Grade Fibreglass/Melamine Tube with Copper Ferrule End Caps |
| Agency Certifications | UL Listed (Std 248-12, Guide JDDZ), CSA Certified, CE, RoHS |
Operating Guidelines and Usage Tips
SAFETY NOTICE: Always isolate power supplies and confirm circuits are de-energized using a calibrated voltage meter before replacing fuses.
Motor Sizing Rules: Size the fuse up to 175% (or 225% max under heavy loads) of the motor’s full-load amperes (FLA) in accordance with NEC Article 430 requirements.
Holder Compatibility: Always pair with dedicated Class R rejection fuse blocks (such as Bussmann RM60030 series) to ensure the rejection pin feature engages correctly.
To review official Class RK5 dual-element fuse specifications and motor circuit protection standards, consult the National Electrical Manufacturers Association (NEMA) Directory.
To check regional warehouse inventory availability or request commercial quotes for volume electrical fuses, visit the Control Qatar Contact Page.
